环境激励下移动车辆对桥梁模态参数识别的影响研究

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摘要基于环境激励的模态参数识别方法在桥梁健康监测领域应用广泛，所识别桥梁的模态参数的变化常用来进行损伤识别。然而在模态参数识别过程中，移动车辆本身具有的质量属性被忽视，仅被当作为环境激励的一部分。桥梁损伤导致的模态参数变化将被移动车辆所引起的变化掩盖，影响后续损伤识别的效果。本文以随机子空间法为例，研究环境激励下的模态参数识别方法识别的桥梁模态参数的变异情况，并对比桥梁局部损伤导致的桥梁模态参数的变化量，结果表明局部损伤和移动车辆都会造成频率频率减小和振型改变，因此在实际模态测试中需要考虑移动车辆作用并剔除其影响。

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	贺文宇1
	2
	丁绪聪1
	2
	任伟新1
	2

关键词 ：模态参数识别, 移动车辆, 桥梁损伤, 随机子空间法, 环境激励

Abstract：Modal parametric identification under ambient excitation is widely used in the field of bridge health monitoring, and identified modal parameters are often employed for bridge damage detection. However, in process of modal parametric identification, the mass attribute of mobile vehicle itself is ignored and only regarded as a part of environmental excitation. The changes of modal parameters caused by bridge damage are covered by changes caused by moving vehicles to affect the effect of subsequent damage identification. Here, the variation of bridge modal parameters identified with the modal parametric identification method under ambient excitation was studied, and compared with the variation of bridge modal parameters caused by local damage of bridge. The results showed that both local damage and moving vehicle can reduce bridge modal frequencies and change its modal shapes, so it is necessary to consider action of moving vehicle, and eliminate its effects in actual modal testing.

Key words： modal parametric identification moving vehicle bridge damage stochastic subspace method ambient excitation

收稿日期: 2019-10-11 出版日期: 2021-02-15

引用本文:

贺文宇1,2，丁绪聪1,2，任伟新1,2. 环境激励下移动车辆对桥梁模态参数识别的影响研究[J]. 振动与冲击, 2021, 40(3): 48-53.
HE Wenyu1,2, DING Xucong1,2, REN Weixin1,2. Effects of moving vehicle on bridge modal parametric identification under ambient excitation. JOURNAL OF VIBRATION AND SHOCK, 2021, 40(3): 48-53.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2021/V40/I3/48

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